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Originally posted by swampfox Thats how that old grey flex looks in just about every attic I see it in, mice or no mice, stuff just falls apart over time

Ultra violet light will cause the gray jacket to become brittle and fail. That's what this one looks like happened. Doesn't need mice, rats, or the HO storing boxes on top of the flex duct - it just turns to dust.

Originally posted by swampfox Thats how that old grey flex looks in just about every attic I see it in, mice or no mice, stuff just falls apart over time

Ultra violet light will cause the gray jacket to become brittle and fail. That's what this one looks like happened. Doesn't need mice, rats, or the HO storing boxes on top of the flex duct - it just turns to dust.

Exactly! If sunlight (UV) gets to flex with grey vinyl bapor barrier it will crumble. I try to always use foil now.

There is nothing more frightful than ignorance in action....Mark Twain